ID   APCB_ANAVA              Reviewed;         161 AA.
AC   P00317;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   03-AUG-2022, entry version 91.
DE   RecName: Full=Allophycocyanin beta chain;
GN   Name=apcB;
OS   Anabaena variabilis.
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Trichormus.
OX   NCBI_TaxID=264691;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   STRAIN=PCC 7118 / ATCC 27892;
RX   PubMed=6793571; DOI=10.1016/s0021-9258(19)68798-3;
RA   Delange R.J., Williams L.C., Glazer A.N.;
RT   "The amino acid sequence of the beta subunit of allophycocyanin.";
RL   J. Biol. Chem. 256:9558-9566(1981).
RN   [2]
RP   METHYLATION AT ASN-71.
RX   PubMed=3782095; DOI=10.1016/s0021-9258(18)66647-5;
RA   Klotz A.V., Leary J.A., Glazer A.N.;
RT   "Post-translational methylation of asparaginyl residues. Identification of
RT   beta-71 gamma-N-methylasparagine in allophycocyanin.";
RL   J. Biol. Chem. 261:15891-15894(1986).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex. Allophycocyanin has a maximum absorption at
CC       approximately 650 nanometers.
CC   -!- SUBUNIT: Heterodimer of an alpha and a beta chain.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Peripheral membrane
CC       protein; Cytoplasmic side. Note=Forms the core of the phycobilisome.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   PIR; A00328; AFAIB.
DR   AlphaFoldDB; P00317; -.
DR   SMR; P00317; -.
DR   iPTMnet; P00317; -.
DR   GO; GO:0030089; C:phycobilisome; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   CDD; cd12126; APC_beta; 1.
DR   Gene3D; 1.10.490.20; -; 1.
DR   InterPro; IPR006245; ApcB.
DR   InterPro; IPR009050; Globin-like_sf.
DR   InterPro; IPR012128; Phycobilisome_asu/bsu.
DR   InterPro; IPR038719; Phycobilisome_asu/bsu_sf.
DR   PANTHER; PTHR34011:SF3; PTHR34011:SF3; 1.
DR   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
DR   TIGRFAMs; TIGR01337; apcB; 1.
PE   1: Evidence at protein level;
KW   Antenna complex; Bile pigment; Chromophore; Direct protein sequencing;
KW   Electron transport; Membrane; Methylation; Photosynthesis; Phycobilisome;
KW   Thylakoid; Transport.
FT   CHAIN           1..161
FT                   /note="Allophycocyanin beta chain"
FT                   /id="PRO_0000199094"
FT   BINDING         81
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT   MOD_RES         71
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000269|PubMed:3782095"
SQ   SEQUENCE   161 AA;  17187 MW;  7F288EE625711A71 CRC64;
     AQDAITAVIN SADVQGKYLD TAALEKLKAY FSTGELRVRA ATTISANAAA IVKEAVAKSL
     LYSDITRPGG NMYTTRRYAA CIRDLDYYLR YATYAMLAGD PSILDERVLN GLKETYNSLG
     VPVGATVQAI QAIKEVTASL VGAKAGKEMG IYLDYISSGL S